.nav{position:absolute; z-index:100;top: 10px;left:10px}
.nav div{position: absolute;width:20px;height:20px;cursor:pointer;background-repeat: no-repeat;}
.up{background:url(../images/up.gif);left: 21px;}
.right{background:url(../images/right.gif);left: 42px; top: 21px;}
.down{background:url(../images/down.gif);top:42px;left: 21px;}
.left{background:url(../images/left.gif);top:21px;left: 0;}
.zoom{background:url(../images/zoom.gif);top:21px;;left: 21px;}
.in{background:url(../images/in.gif);top:63px;;left: 21px;}
.out{background:url(../images/out.gif);top:84px;;left: 21px;}